Obsidian Unknown locality Dimensions: 6.5 x 3.5 x 1.5 cm
Interesting obsidian with streaks. Obsidian is a natural volcanic glass created when silica-rich lava cools so rapidly that crystals have no opportunity to form. Variations in color and pattern result from tiny inclusions, trapped gases, and subtle changes in the chemistry of the lava during cooling. Streaked obsidian is especially appreciated for these natural flow patterns, which make every polished slice completely unique.
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